I have a 2007 fit, and have heard this noise for the longest time, and have no idea what it is, nor exactly where it comes from. But basically when I leave the house in the morning, and pull up to the first stop sign, I hear this noise for like 1 second that sounds like one of those Vuvuzela horns, and it seems to be coming either from middle of car, or back. My best guess is it has something to do with gas tank? Anyone else heard this sound?

 

I don't have the answer, but I also hear this noise and find it pleasant, never thought much of it... Though I've only owned my fit for 600 miles ^_^